Struts2提供了基于验证框架的输入校验，在这种校验方式下，所有的输入校验只需要编写简单的配置文件，Struts2的验证框架将会负责进行服务器校验和客户端校验。
校验失败后将Struts2将自动返回名为“input”的Result，如需制定错误显示页面，则通过struts.xml来配置“input”的Result。在Result视图中使用<s:fielderror/>标签即可输入校验失败的提示信息。
User.java
package models;
import java.util.Date;
import com.opensymphony.xwork2.validator.annotations.RegexFieldValidator;
import com.opensymphony.xwork2.validator.annotations.RequiredStringValidator;
public class User {
private String username;
private String password;
private Date birth;
public String getUsername() {
return username;
}
// 基于注解的输入校验
@RequiredStringValidator(key = "username.requried", message = "")
@RegexFieldValidator(regex = "\\w{4,25}", key = "username.regex", message = "")
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Date getBirth() {
return birth;
}
public void setBirth(Date birth) {
this.birth = birth;
}
@Override
public int hashCode() {
// TODO Auto-generated method stub
return getUsername().hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
} else if (obj != null && obj.getClass() == User.class) {
User objUser = (User) obj;
if (objUser.getUsername().equals(this.getUsername())) {
return true;
}
}
return false;
}
}
login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title><s:text name="login page"></s:text></title>
</head>
<body>
<s:form action="login.action" validate="true">
<s:textfield name="user.username" key="username" />
<s:password name="user.password" key="password" />
<s:textfield name="user.birth" key="birth" />
<s:submit value="login" />
</s:form>
</body>
</html>
LoginAction.java
package actions;
import models.User;
import com.opensymphony.xwork2.ActionSupport;
public class LoginAction extends ActionSupport {
private User user;
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
@Override
public String execute() throws Exception {
if (getUser().getUsername().equals("yangys")
&& getUser().getPassword().equals("666666")) {
return SUCCESS;
}
return ERROR;
}
}
Struts2的校验文件规则为：每个Action都有一个校验文件，该文件的文件名应该遵守的规则<ActionName>-validation.xml
LoginAction-validation.xml
<?xml version="1.0" encoding="GBK"?>
<!DOCTYPE validators PUBLIC
"-//Apache Struts//XWork Validator 1.0.3//EN"
"http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd">
<validators>
<field name="user.username">
<field-validator type="requiredstring">
<param name="trim">true</param>
<message key="user.username.requried"/>
</field-validator>
</field>
<field name="user.password">
<field-validator type="requiredstring">
<param name="trim">true</param>
<message key="user.password.requried"/>
</field-validator>
<field-validator type="regex">
<param name="regex"><![CDATA[(\w{4,25})]]></param>
<message key="user.password.regex"/>
</field-validator>
</field>
<field name="user.birth">
<field-validator type="date">
<param name="min">1900-01-01</param>
<param name="max">2016-02-14</param>
<message key="user.birth.range"/>
<!-- <message>生日必须在1900-01-01到2016-02-14之间</message> -->
</field-validator>
</field>
</validators>
其中message标签内为校验失败后的提示信息，可以直接写在<message></message>标签内，也可以通过<message key=""/>从国际化资源文件中提取显示。
LoginAction_zh_CN.properties(native2ascii处理过)
user.username.requried=\u5FC5\u987B\u8F93\u5165\u7528\u6237\u540D
user.password.requried=\u5FC5\u987B\u8F93\u5165\u5BC6\u7801
user.password.regex=\u5BC6\u7801\u5FC5\u987B\u662F\u5B57\u6BCD\u6216\u6570\u5B57\uFF0C\u957F\u5EA6\u57284\u523025\u4E4B\u95F4
user.birth.range=\u751F\u65E5\u5FC5\u987B\u5728${min}\u548C${max}\u4E4B\u95F4
时间： 2024-10-07 15:21:59